CMH Pub 7-4-1 Cross-Channel Attack by Gordon A. Harrison. First published 1951.
"This first European Theater of Operations tactical volume covers the prelude to the 6 June 1944 assault and combat operations of the First U.S. Army in Normandy to 1 July 1944."
GPO number: 008-029-00287-6
Digitized by the U.S. Army Center of Military History: http://www.history.army.mil